New Post: Failed to load the certificate

Hi Guys,
i try to Import a code signing certificate in to wpp. I enter the Password for the pfx file and chosose the right file. After that i received follow error message: Faild to load the certificate. Check the file.

I used follow howto's:
http://www.theitcave.com/post/194
https://wsuspackagepublisher.codeplex.com/discussions/579215

WPP Version: 1.3.1511.15